Simulation training for supervision of power work safety is important for ensuringing high-quality and uninterrupted power service．The introduction of virtual reality technology，not only can save teachers resources and hardware resources，but also enhances the effect of training．This paper discusses the key technologies of simulation training system for supervision of power work safety based on Virtual Reality，including 3D modeling，collision detection, interactive behavior control and so on，and elaborates the framework of system and function of each module．The development and application of system bring convenience for staff training and effective to improve the levels of power safe operation．